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f(-3)=a(-3)+b
17= -3a+b ⇒ -3a+b =17
f(-1)= a(-1)+b
-1= -a+b ⇒ -a+b = -1
eliminasikan:
-3a+b=17
-a+b = -1 -
-2a=18 ⇒ a= -9
-3a+b=17
-3(-9)+b=17
27+b=17 ⇒ b= -10
f(x)= ax + b
f(3)=a(3)+b = -9(3)+(-10)= -27-10= -37 (B)
f(-1)= a(-1)+b=-1
-3a+b = 17
-a+b=-1 _
-3a = 18
a = -6
-a+b=-1
6+b=-1
b=-7
f(3)= -6(3) + -7 =-18+ (-7) = -25